国产欧美精品一区二区,中文字幕专区在线亚洲,国产精品美女网站在线观看,艾秋果冻传媒2021精品,在线免费一区二区,久久久久久青草大香综合精品,日韩美aaa特级毛片,欧美成人精品午夜免费影视

In flight test, hovering performance is an important test subject for helicopter performance. The scientific research flight test of this subject requires a large number of sample data (altitude, temperature, weight, configuration combination) to get more accurate test conclusions. Among them, the ground height is the key parameter of hover test and small speed flight test. Low altitude information of helicopter is usually obtained by air pressure height sensor and radio altimeter. Due to many disturbances such as ground effect, posture, wind speed and wind direction, the high accuracy and reliability can,t be guaranteed. Laser ranging has gradually become an advanced measurement method for helicopter low altitude measurement. But in the specific implementation process, the error of laser height measurement increases and fails due to the change of helicopter maneuvering flight attitude. The airborne attitude follow technology not only overcomes the low altitude measurement error and failure caused by the attitude change in the helicopter"s maneuver state, but also combines the low altitude data by the airborne integrated acquisition system and sends it to the ground station telemetry receiving and storage in real time. It can greatly expand the data samples and obtain more accurate data. The conclusion of the test.